Siemens SL10 Repair Documentation page 5

The TCXO (Temperature Compensated Crystal Oscillator) is responsible for generating the
13 MHz reference frequency of the handset.
If it is defective, the handset cannot synchronize to the base station anymore.
2.3 Priority:

........ Mandatory

........ Repair

........ Optional

........ Not Yet Defined
2.4 Repair Documentation
2.4.1 Description of procedure:
2.4.1.1 Diagnosis
2.4.1.2 Repair by component change
2.4.1.3 Repair by SW-Booting
V1.3
Check the output frequency of the TCXO using the level-2 testing
program for SL10.
Set the „Simulator" option in the S611.INI file to 0 and restart
the program. Start the test. When the program says „Check power and
phase of external antenna with your GSM-Tester", switch the CMD to
„LOCAL" mode and enter the „MODULE TEST".
On the CMD display you can see the frequency error of the handset.
(Make sure that the CMD is on channel 124, power level 5!)
If the frequency error is higher than 2kHz, the TCXO has to be
replaced.
Use hot air blower to remove defective TCXO.
Avoid excessive heat!
Watch surrounding components!
Resolder new TCXO afterwards.
Not possible!
Page 5 of 31
Information and Communication Products
Communication Devices
ICP CD ST
D. Schnoor
08/98